Maybe in the office, art studio or the used book/game/comic store This a cool idea for art work in a space. If it is a temporary space for you, cover walls with white butcher paper, then go to town drawing.
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Swipe art is good for older people with limited hand mobility. Put dots of paint on the paper or canvas then let the participant swipe with different tools: small heavy cardboard, sponge, flexible brush, the butt of a closed hand, etc.